简便计算:199x99十99和98x55

2025-03-22 18:36:01
推荐回答(4个)
回答1:


回答2:

199×99+99
=99×(199+1)
=99×200
=19800,
98×55
=100×55-2×55
=5500-110
=5390

回答3:


回答4:

199×99+99=(199+1)×99=200×99=19800
98×55=98×5×11=490×11=4900+490=5390